Like others said, you can buy a set of cheaper starter caps, while you wait for a GB to deliver.
GB involves risk and uncertainty, especially in today's world. I ordered GMK 9009 R3 during the summer of 2019. It was delayed by the pandemic, and there were QC issues with the GBs being produced around that time. Overall, my caps were good, but it would be nice to get some spacebar replacements, and one of the delete keys is kinda chipped [not the main one, though].
So you're going to be waiting for a GB during a pandemic and other crises. It's not the best model for the customer right now. The advantage is that you get it cheaper [sometimes far cheaper] than aftermarket prices, and you often get to pick the parts you want.
So from a financial standpoint, if the GB succeeds, then it is worth it. Because paying aftermarket for a set you want is really prohibitive. And it can be difficult to even get it. I wanted dev/tty and they all got snatched up before I had a chance. No matter what. So I had to go in on a GB.
Also, just a couple of years ago, there were hardly any entry-level sets that were truly 'decent' for a decent price. Now there is with HK Gaming and Novelkeys Cherry Profile. If sets like those had been available back in 2016-2018, there might have been less demand for premium GB sets. You can just use one of these decent sets if it is compatible with your layout. If not, then you pretty much have to get in on a GB. Good news is, some manufacturers like Signature Plastics have a fairly quick turnaround. The new DCS Sleeper probably won't take 9-12 months to deliver.